HarmonyOS 鸿蒙Next RichEditor中有没有清空所有数据的API？没有的话有没有什么办法能够解决

@Entry
@Component
struct Index {
  controller: RichEditorController = new RichEditorController()
  options: RichEditorOptions = { controller: this.controller };
  @State textFlag: string = "TextFlag";
build() {
Column() {
Column() {
Text(this.textFlag)
.copyOption(CopyOptions.InApp)
.fontSize(50)
}
Divider()
Column() {
Button(“删除选择内容”).onClick(() => {
this.controller.deleteSpans({
start: 0,
end: 5
})
})
RichEditor(this.options)
.onReady(() => {
this.controller.addTextSpan(‘Area1\n’, {
style:
{
fontColor: Color.Orange,
fontSize: 50
},
gesture:
{
onClick: () => {
this.textFlag = “Area1 is onClick.”
},
onLongPress: () => {
this.textFlag = “Area1 is onLongPress.”
}
}
})
})
}
.borderColor(Color.Red)
.width(“100%”)
.height(“70%”)
}
}
}